WO2020254467A1 - Vis d'extrudeuse, appareil de moulage par injection et procédé de moulage par injection - Google Patents

Vis d'extrudeuse, appareil de moulage par injection et procédé de moulage par injection Download PDF

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Publication number
WO2020254467A1
WO2020254467A1 PCT/EP2020/066882 EP2020066882W WO2020254467A1 WO 2020254467 A1 WO2020254467 A1 WO 2020254467A1 EP 2020066882 W EP2020066882 W EP 2020066882W WO 2020254467 A1 WO2020254467 A1 WO 2020254467A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
section
extruder screw
blisters
injection molding
Prior art date
Application number
PCT/EP2020/066882
Other languages
English (en)
Inventor
Per Foged SKJØDT
Lars Mose HENRIKSEN
Original Assignee
Lego A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lego A/S filed Critical Lego A/S
Publication of WO2020254467A1 publication Critical patent/WO2020254467A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/60—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B29C45/1866—Feeding multiple materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/565—Screws having projections other than the thread, e.g. pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/575—Screws provided with elements of a generally circular cross-section for shearing the melt, i.e. shear-ring elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/58—Screws provided with seal ring elements, i.e. elements of generally circular and tapered shape for preventing the back flow of the melt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/585—Screws provided with gears interacting with the flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/63—Screws having sections without mixing elements or threads, i.e. having cylinder shaped sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/45—Axially movable screws

Definitions

  • An extruder screw, an injection molding apparatus and a method of in jection molding An extruder screw, an injection molding apparatus and a method of in jection molding.
  • the present invention relates to an extruder screw for injection mold- ing as well as an injection molding apparatus and a method of injec tion molding.
  • US patent number 5567370 discloses an injection molding tool of the above mentioned type adapted for producing foamed products.
  • This injection molding tool comprises an extruder screw with a screw core extending along an axis of rotation/symmetry and comprising a con veying screw section arranged upstream from a mixing screw section, and where the mixing screw section comprises two or more blisters being mutually separated by one or more distributive mixing sections, and where the two or more blisters each has a intermediate section forming a circular cylindrical surface, a diverging surface upstream from the intermediate section, and a converging surface downstream from the intermediate section, and where the diverging and the con verging surfaces each are formed as a frustoconical surface with the smallest diameter being equal to the screw core and the largest diam eter being equal to the diameter of the circular cylindrical surface of the intermediate section.
  • extruder screw and extruder barrel relates to such screws and barrels adapted for use in injection molding ma- chines as well as extrusion machines, where the screw and barrels are used primarily for plasticizing and or mixing plastic material.
  • the length of the blisters is in this relation measured by the length of the circular cylindrical surface of the intermediate section, measured in a direction parallel with the axis of rotation/symmetry.
  • this length is advantageously smaller than 1/5 and preferably smaller than 1/10 of the difference between the smallest and the largest diam eter of both the diverging and the converging surface.
  • the distributive mixing sections arranged between two of the blisters comprises a multiple pins extending sub stantially radially from the screw core. Furthermore all the blisters are preferably mutually separated by a dis tributive mixing section.
  • the extruder screw according to the invention comprises at least 3 blisters.
  • the invention also provides an injection molding apparatus comprising an extruder screw as mentioned above, and having an extruder barrel surrounding the extruder screw as well as a hopper and a feed port ar- ranged in the barrel for feeding plastic granules from the hopper to the conveying screw section of the extruder screw.
  • the injection molding apparatus may advantageously have two or more hoppers each being connected to a feed port ar- ranged in the barrel for feeding plastic granules from the hopper to the conveying screw section of the extruder screw.
  • the method comprises injection molding a product from two or more different plastic materials having different color or other material characteristics, and the two plastic ma terials are simultaneously mixed by using an extruder screw, and an injection molding apparatus as mentioned above.
  • Figure 1 Is a side view of a part of an extruder screw according to the invention.
  • Figure 2 Is a cross section view along the lines A-A of the extruder screw as shown in fig. 1.
  • Description of an embodiment Figure 1 and 2 shows a part of an extruder screw according to the in vention having an axis of rotation/symmetry 1 and a conveying section 2 adapted for conveying plastic materials from right to left in the figure.
  • the extruder screw is arranged inside a heated extruder barrel forming part of e.g. an injection molding apparatus, and the barrel is equipped with one or preferably more hoppers and feed ports arranged in the barrel for leading e.g. thermoplastic material to the conveying section 2 of the extruder screw.
  • the extruder screw is equipped with four blisters 4
  • each of these blisters 4 comprises an intermediate section forming a circular cylindrical surface 5 as well as a diverging section forming a frustocon- ical surface 7 and a converging section forming another frustoconical surface 6 together forming an annular ridge around the core 9 of the extruder screw.
  • the surfaces of the converging sections 6 and surfaces of the diverg- ing sections 7 all have a smallest diameter corresponding to the diam eter of the core 9 og the extruder screw, and a largest diameter corre sponding to the diameter of the surface of the intermediate section 5 of the blisters 4.
  • the length of the blisters 4, defined by the length of circular cylindrical surface 5 on the intermediate section of the blisters 4, are short and at least shorter than the difference be tween the smallest and the largest diameter of the surfaces 6, 7 of the converging and the diverging sections of the blisters 4.
  • the dispersive mixing effect of the short blisters 4 has proven to be very efficient due to the fact that the short blisters 4 allows using more blisters 4 without thereby introducing a large pressure drop along the extruder screw and without unnecessary increasing the temperature of the plastic material.
  • the circular cylindrical surface 5 of each of the intermediate sections of the blisters 4 is therefore al most zero, or reduced to the minimal value that is possible using nor mal machining technology.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une vis d'extrudeuse, par exemple pour un appareil de moulage par injection, la vis d'extrudeuse ayant un noyau de vis s'étendant le long d'un axe de rotation/symétrie (1) et comprenant une section de vis de transport (2) disposée en amont d'une section de vis de mélange (3), et la section de vis de mélange (3) comprenant au moins deux sections de mélange dispersives comprenant chacune une alvéole (4) et les alvéoles (4) étant séparées entre elles par une ou plusieurs sections de mélange distributrices, et les deux alvéoles ou plus ayant chacune une section intermédiaire (5) formant une surface cylindrique circulaire, une surface divergente (7) en amont de la section intermédiaire et une surface convergente (6) en aval de la section intermédiaire, et la longueur de la surface cylindrique circulaire de la section intermédiaire (5), mesurée dans une direction parallèle à l'axe de rotation/symétrie, étant inférieure à la différence entre le plus petit et le plus grand diamètre de chacune des surfaces divergente et convergente (6, 7).
PCT/EP2020/066882 2019-06-21 2020-06-18 Vis d'extrudeuse, appareil de moulage par injection et procédé de moulage par injection WO2020254467A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201970393 2019-06-21
DKPA201970393 2019-06-21

Publications (1)

Publication Number Publication Date
WO2020254467A1 true WO2020254467A1 (fr) 2020-12-24

Family

ID=71108611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/066882 WO2020254467A1 (fr) 2019-06-21 2020-06-18 Vis d'extrudeuse, appareil de moulage par injection et procédé de moulage par injection

Country Status (1)

Country Link
WO (1) WO2020254467A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604520A1 (de) * 1975-10-07 1977-04-21 Sandretto Spa Plastifizierungseinrichtung
DE3910132A1 (de) * 1988-04-21 1989-11-09 Schwerin Plastmaschinen Plastizierschnecke und mischvorrichtung zur direktverarbeitung und -einfaerbung von kunststoff-regeneratgemischen und kunststoff-primaermaterialien auf spritzgiessmaschinen
WO1990007412A1 (fr) * 1988-12-23 1990-07-12 Jv Kunststoffwerk Gmbh Procede et dispositif de fabrication de pieces moulees en plastique
US5567370A (en) 1994-01-19 1996-10-22 Hermann Berstorff Maschinenbau Gmbh Process for the production of TPE foam profiles for the building and automotive industries
DE10009843A1 (de) * 2000-02-24 2001-09-06 Mannesmann Ag Extruder mit Blister

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604520A1 (de) * 1975-10-07 1977-04-21 Sandretto Spa Plastifizierungseinrichtung
DE3910132A1 (de) * 1988-04-21 1989-11-09 Schwerin Plastmaschinen Plastizierschnecke und mischvorrichtung zur direktverarbeitung und -einfaerbung von kunststoff-regeneratgemischen und kunststoff-primaermaterialien auf spritzgiessmaschinen
WO1990007412A1 (fr) * 1988-12-23 1990-07-12 Jv Kunststoffwerk Gmbh Procede et dispositif de fabrication de pieces moulees en plastique
US5567370A (en) 1994-01-19 1996-10-22 Hermann Berstorff Maschinenbau Gmbh Process for the production of TPE foam profiles for the building and automotive industries
DE10009843A1 (de) * 2000-02-24 2001-09-06 Mannesmann Ag Extruder mit Blister

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